Journal of Algebra · 1975 · 12 citations · 12 references
Natural SciencesEconomicsCombinatorial ChemistryGroup TheoryFree Groups
12
P. M. Cohn, Wilhelm Magnus, A. Karrass et al. · American Mathematical Monthly · 1967 · 1.3K citations
Mose Newman · Journal of the Franklin Institute · 1967 · 654 citations